Wiimc 1.3.4 (latest?) + Ustealth is
linked on first post. seems this file has been deleted.
I'll see if I have it on my computer and I'll upload it again.
Sorry, I don't have 1.3.4 Ustealth (I guess I forgot to archive it)
If someone has it, please let us know.
WiiSXR is listed as natively compatible, you should check WiiSXR project and get the latest release from there.
Unless the devs updated to regular libfat, in that case it needs a recompile with patched libfat (I just made one, I'll upload it in a minute, just in case users would like libfat1.1.1 for their homebrew projects)
Edit:
LibFat v1.1.1 with Ustealth patch
https://filetrip.net/dl?AIkKo9H8Dv
note: UNTESTED, I only edited line 183 of partition.c and recompiled with devkitPPC r29-1